Nippon Steel Corporation

Shozo Sekino

Koe Nakajima

Hiroshi Katoh

Yoshikazu Matsumura

Yasumitsu Onoe

Shoji Murota

Yuzo Hosoi

Yutaka Tsuchida

Mizuo Sakakihara

Noboru Shinoda

A heat-resistant alloy suitable for welded structures, particularly suitable for nuclear reactors, and free from the adverse effect of the cobalt used therein, which alloy has a basic composition comprising; 0.01-0.2% C, not more than 0.50% Si, not more than 0.50% Mn, 10 to 25% Cr, not more than 0.030% B, not more than 0.50% Zr, not more than 20% of (Mo+1/2W), 0.001 to 0.04% Y, not more than 2.0% Al, and not more than 1.0% Ti, with the balance being Ni and unavoidable impurities.

Heat-resistant alloy for welded structures

A process for producing a steel having excellent strength and toughness, which comprises continuously casting a molten steel containing 0.01 - 0.10% Al and 0.002 - 0.009% N with an average cooling rate of not lower than 3.degree. C/min. down to 500.degree. C to obtain a steel slab heating the steel slab to a temperature ranging from 900.degree. to 1150.degree. C and rolling the steel slab.

Process for producing a steel having excellent strength and toughness

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Kitakyushu, Japan

Shozo Sekino